css/css-animations/CSSAnimation-compositeOrder.tentative.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>Animation composite order</title>
<link rel="help" href="https://drafts.csswg.org/css-animations-2/#animation-composite-order">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/testcommon.js"></script>
<style>
@keyframes margin50 {
  from {
    margin-left: 50px;
  }
  to {
    margin-left: 50px;
  }
}
@keyframes margin100 {
  from {
    margin-left: 100px;
  }
  to {
    margin-left: 100px;
  }
}
</style>
<div id="log"</div>
<script>
'use strict';

promise_test(async t => {
  const div = addDiv(t);
  div.style.animation = 'margin100 100s';
  assert_equals(getComputedStyle(div).marginLeft, '100px');
  div.style.animation = 'margin50 100s, margin100 100s';
  // The margin should be unaffected by margin50 since it is named earlier
  // in the animation list.
  assert_equals(getComputedStyle(div).marginLeft, '100px');
}, "Animations are composited by their order in the animation-name property.");

promise_test(async t => {
  const div = addDiv(t);
  const animA = div.animate({margin: ["100px","100px"]}, 100000);
  assert_equals(getComputedStyle(div).marginLeft, '100px');
  div.style.animation = 'margin50 100s';
  // Wait for animation starts
  await animA.ready;
  await waitForAnimationFrames(1);
  assert_equals(getComputedStyle(div).marginLeft, '100px',
                "A higher-priority animation is not overriden by a more recent"
                + "one.");
}, 'Web-animation replaces CSS animation');

</script>